2021
DOI: 10.48550/arxiv.2111.01437
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Instability and self-propulsion of active droplets along a wall

Abstract: Active droplets can swim spontaneously in viscous flows as a result of the non-linear convective transport of a chemical solute produced at their surface by the Marangoni and/or phoretic flows generated by this solute's inhomogeneous distribution, provided the ratio of convective-to-diffusive solute transport, or Péclet number Pe is large enough. As the result of their net buoyancy, active drops typically evolve at a small finite distance d from rigid boundaries. Yet, existing models systematically focus on un… Show more

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Cited by 3 publications
(3 citation statements)
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References 67 publications
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“…The polarization in the concentration of oil-filled micelles leads to the vertical "pumping" flow and sometimes droplet levitation, even for droplets that are not laterally self-propelled. Such results are consistent with simulations of flow for low Péclet number droplets near a wall [16] and have also been observed previously. [10,11] Based on the data in Figures 1, 2 it appeared that several variables, including the droplet composition and surfactant conditions, were influential in determining whether droplets exhibited either repulsive or attractive flow.…”
Section: Resultssupporting
confidence: 92%
“…The polarization in the concentration of oil-filled micelles leads to the vertical "pumping" flow and sometimes droplet levitation, even for droplets that are not laterally self-propelled. Such results are consistent with simulations of flow for low Péclet number droplets near a wall [16] and have also been observed previously. [10,11] Based on the data in Figures 1, 2 it appeared that several variables, including the droplet composition and surfactant conditions, were influential in determining whether droplets exhibited either repulsive or attractive flow.…”
Section: Resultssupporting
confidence: 92%
“…The polarization in the concentration of oil-filled micelles leads to the vertical "pumping" flow and sometimes droplet levitation, even for droplets that are not laterally selfpropelled. Such results are consistent with simulations of flow for low Péclet number droplets near a wall [16] and have also been observed previously [10][11] .…”
Section: Resultssupporting
confidence: 92%
“…The polarization in the concentration of solubilized oil leads to the vertical "pumping" flow for isolated droplets, and sometimes droplet levitation, even for droplets that are not laterally self-propelled. Such results are consistent with simulations of flow for low Péclet number droplets near a wall [17] and have also been experimentally observed previously [10][11] .…”
Section: Resultssupporting
confidence: 92%